I never could get c2t to work, even after fiddling for hours. It seems like a much more elegant solution than ADTPro (and much leaner!). It offers compression, etc, which ADTPro does not. In the Cassette port mode it only has RLE compression and that can't be turned off, so Exomized games take LONGER to transfer than if the RLE compression had been turned off!)
Agree that having singleload, portable programs is the way to preserve our beloved Apple II treasures far into the future, when even hard drives will disappear. A regular 3.5mm stereo pcb headphone jack and a nifty program like c2t ported to "Whatever whiz-bang phone / OS of the future" is all it will take to give us another 50 years of classics, Who would have thought 1970s technology will persevere long after "sophisticated" solutions have all vanished? Woz had profound foresight! The key is in the AUDIO waveform!